What do you know about [b]5-htp[.b]? This is actually the precursor to the serotonin. Serotonin, on the other hand, is the neurotransmitter that is believed to be responsible in the happiness of an individual. In addition to that, this is an easy and simple way of increasing the serotonin levels in the brain by way of bypassing the so-called rate-limiting step. And thus, users will be able to reap off all rewards including the danger of the sudden increase in the brain serotonin.